I am not familiar with the Aurelia bridge for Kendo UI, but using the Kendo UI data source component you may consider the following approaches.
You can use a custom function for the transport.read
setting and make the request to the service as you'd like.
You can also use the jQuery AJAX
(Kendo UI data source uses jQuery AJAX behind the scenes to make the request) settings to configure the request parameters and send them correctly to your service as explained here
You can also use the transport.parameterMap
to modify and adjust the parameters before the request is made.
I hope that this works for you.